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Constitutive modeling and dynamic softening mechanism during hot deformation of an ultra-pure 17%Cr ferritic stainless steel stabilized with Nb

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Abstract

The hot deformation behavior of an ultra-pure 17%Cr ferritic stainless steel was studied in the temperature range of 750–1000 °C and strain rates of 0.5 to 10 s−1 using isothermal hot compression tests in a thermomechanical simulator. The microstructural evolution was investigated using electron backscattered diffraction and transmission electron microscopy. A modified constitutive equation considering the effect of strain on material constant was developed, which predicted the flow stress for the deformation conditions studied, except at 950 °C in 1 s−1 and 900 °C in 10 s−1. Decreasing deformation temperature and increasing strain was beneficial in refining the microstructure. Decreasing deformation temperature, the in-grain shear bands appeared in the microstructure. It is suggested that the dynamic softening mechanism is closely related to deformation temperature. At low deformation temperature, dynamic recovery was major softening mechanism and no dynamic recrystallization occurred. At high deformation temperature, dynamic softening was explained in terms of efficient dynamic recovery and limited continuous dynamic recrystallization. A drop in the flow stress was not found due to very small fraction of new grains nucleated during dynamic recrystallization.

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Authors and Affiliations

  1. College of Materials and Metallurgy, Northeastern University, Shenyang, 110819, PR China

    Fei Gao & Fuxiao Yu

  2. State Key Lab of Rolling Technologies and Automation, Northeastern University, Shenyang, 110819, PR China

    Zhenyu Liu & Haitao Liu

  3. Laboratory for Excellence in Advanced Steel Research, Center for Structural and Functional Materials, University of Louisiana at Lafayette, Lafayette, LA, 70503, USA

    R. D. K. Misra

Authors
  1. Fei Gao
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  2. Zhenyu Liu
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  3. R. D. K. Misra
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  4. Haitao Liu
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  5. Fuxiao Yu
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Correspondence to Fei Gao.

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Gao, F., Liu, Z., Misra, R.D.K. et al. Constitutive modeling and dynamic softening mechanism during hot deformation of an ultra-pure 17%Cr ferritic stainless steel stabilized with Nb. Met. Mater. Int. 20, 939–951 (2014). https://doi.org/10.1007/s12540-014-5020-z

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  • DOI: https://doi.org/10.1007/s12540-014-5020-z

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